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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/8581Full metadata record
| ???org.dspace.app.webui.jsptag.ItemTag.dcfield??? | Value | Language |
|---|---|---|
| dc.contributor.advisor | 張寶棣(Pao-Ti Chang) | |
| dc.contributor.author | Yi-Ting Duh | en |
| dc.contributor.author | 杜伊婷 | zh_TW |
| dc.date.accessioned | 2021-05-20T19:58:37Z | - |
| dc.date.available | 2011-08-20 | |
| dc.date.available | 2021-05-20T19:58:37Z | - |
| dc.date.copyright | 2011-08-20 | |
| dc.date.issued | 2011 | |
| dc.date.submitted | 2011-08-18 | |
| dc.identifier.citation | [1] http://www.fnal.gov/pub/inquiring/matter/madeof/index.html
[2] http://pdg.lbl.gov/2011/reviews/rpp2011-rev-ckm-matrix.pdf [3] H.-Y. Cheng, C.-K. Chua and A. Soni, Phys. Rev. D 71, 014030(2005). [4] H.-N. Li, S. Mishima and A.I. Sanda, Phys. Rev. D 72, 114005(2005). [5] S.-W. Lin et al. (Belle Collaboration), Nature 452, 332(2008). [6] http://ckmfitter.in2p3.fr [7] C.-W. Chiang, M. Gronau, J.L. Rosner and D.A. Suprun, Phys. Rev. D 70, 034020 (2004) [8] Y.-Y. Charng and H.-n. Li, Phys. Rev. D 71, 014036 (2005) [9] W.-S. Hou, M. Nagashima and A. Soddu, Phys. Rev. Lett. 95, 141601 (2005) [10] S. Baek, P. Hamel, D. London, A. Datta, D. A. Suprun, Phys. Rev. D 71, 057502 (2005) [11] S.-W. Lin et al. (Belle Collaboration), Phys. Rev. Lett. 98, 181804(2007) [12] S.-W. Lin et al. (Belle Collaboration), Phys. Rev. Lett. 99, 121601(2007) [13] http://belle.kek.jp [14] http://belle2.kek.jp [15] A.Abashian et al., Nuclear Instruments and Methods in Physics Research A 490, 117(2002) [16] The EvtGen package home page http://www.slac.stanford.edu/ lange/EvtGen [17] D. J. Lange, Nucl. Instrum. Methods Phys. Res., Sect. A 462, 152 (2001). [18] E. Barberio and Z. W﹐as, Comput. Phys. Commun. 79, 291(1994); P. Golonka and Z. W﹐as, arXiv:hep-ph/0506026. [19] R. Brun et al., GEANT 3.21, CERN Report DD/EE/84-1,1984. [20] F.Fang, Belle Note 323(2000) [21] R.A. Fisher, Annals of Eugenics 7, 179 (1936). [22] Geoffray C. Fox and Stephen Wolfram, “”Observables for the Analysis of Event Shapes in e+e− Annihilation and Other Processes” Phys. Rev. Lett 41, 1581(1978) [23] The super-Fox-Wolfram was first proposed as an extension of R2 in a series of lectures on continuum suppression at KEK by R. Enomoto in 1999. [24] K. Sakai et al. (Belle Collaboration), Phys. Rev. D 82, 091104(2010). [25] Marko Staric, Belle Note 1145(2010). [26] S.-W. Lin, Belle Note 586(2002). [27] E. White, Belle Note 1207(2011). [28] HFAG home page, http://www.slac.stanford.edu/xorg/hfag/ [29] W.-S. Hou,M. Nagashima and A. Soddu, Phys. Rev. Lett. 95, 141601(2005). [30] S. Baek, P. Hamel, D. London, A. Datta, and D.A. Suprun, Phys. Rev. D 71, 057502(2005). [31] S. Baek, D. London, Phys. Lett. B 653, 249(2007). [32] T.-Y Wu, Belle Note 1178(2011). [33] M. Beneke, G. Buchalla, M. Neubert and C.T. Sachrajda, Nucl. Phys. B 606, 245(2001) [34] MEAN LIFE RATIO τB+/τB0 , http://pdglive.lbl.gov [35] A.J. Buras, R. Fleischer, S. Recksiegel and F. Schwab, Eur. Phys. J.C 45, 701(2006) | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/8581 | - |
| dc.description.abstract | 本篇論文量測帶電B介子衰變至兩個強子機率與電荷宇稱破壞，包括B^+→K^+ π^0, π^+ π^0, K ‾^0 K^+,K^0 π^+和它們的反粒子。以Belle偵測器在正負電子對撞機內收集的772百萬對Ｂ介子做為數據，分析在Υ(4S)共振態的稀有衰變。這個分析是上一次Belle實驗數據量的1.4到1.7倍，實驗的結果也是Belle偵測器以全部的數據做最後一次的更新。
衰變分枝比的實驗結果為： B^+→K^+ π^0=(12.62±0.31(統計)±0.56(系統))×10^(-6) B^+→π^+ π^0=(5.86±0.26±0.38)×10^(-6) B^+→K ‾^0 K^+=(1.11±0.19±0.05)×10^(-6) B^+→K^0 π^+=(23.97±0.53±0.69)×10^(-6) 我們也量測了R_c=1.05±0.03±0.05和R_n=1.04±0.05±0.06，與標準模型在誤差內一致。 電荷宇稱破壞的實驗結果為： B^+→K^+ π^0=+0.043±0.024±0.002 B^+→π^+ π^0=+0.025±0.043±0.007 B^+→K ‾^0 K^+=+0.017±0.168±0.002 B^+→K^0 π^+=-0.014±0.021±0.006 我們確認了電荷宇稱破壞在B^+→K^+ π^0為正值，且在其它衰變中，並無關測到電荷宇稱不對稱。 | zh_TW |
| dc.description.abstract | We report the improved measurements of branching fractions and direct $CP$ violation for charmless
$B$ decays to two hardons, $B^pm o h^pm h^0$. $B^+ o K^+ pi^0$, $pi^+ pi^0$, $overline{K}^0 K^+$ and $K^0 pi^+$ decays and their conjugations are studied with the data of 772 million $B overline{B}$ pairs collected at $Upsilon(4S)$ resonance in Belle detector of $e^+e^-$ collider. This data sample is 1.7 times larger than the previous study for branching fraction and $CP$ violation measurements in $B^+ o overline{K}^0 K^+$ and $B^+ K^0 pi^+$ decays. Also, 1.4 times for $CP$ violation measurements in $B^+ o K^+ pi^0$ and $B^+ pi^+ pi^0$. Besides, this study is the final update for Belle detector with all data sample. The branching fraction are measured to be $mathcal{BR}(B^+ o K^+ pi^0)=(12.62pm 0.31pm 0.56) imes 10^{-6}$, $mathcal{BR}(B^+ o pi^+ pi^0)=(5.86pm 0.26pm 0.38) imes 10^{-6}$, $mathcal{BR}(B^+ o overline{K}^0 K^+)=(1.11 ^{+0.19} _{-0.18} pm 0.05) imes 10^{-6}$ and $mathcal{BR}(B^+ o K^0 pi^+)=(23.97 ^{+0.53} _{-0.52} pm 0.69) imes 10^{-6}$. The first error is statistical and the second one is systematic. We also report the rations of partial widths for $B o K pi$ and $pi pi$ decays. $R_c = 1.05pm 0.03pm 0.05$ and $R_n = 1.04pm 0.05pm 0.06$ are consistent with Standard Model expectations. The direct $CP$ violation measurements are reported to be $mathcal{A}_{cp}(B^+ o K^+ pi^0)=+0.043pm 0.024(stat.)pm 0.002(syst.)$, $mathcal{A}_{cp}(B^+ o pm^+ pi^0)=+0.025pm 0.043pm 0.007$, $mathcal{A}_{cp}(B^+ o overline{K}^0 K^0)=+0.017pm 0.168pm 0.002$ and $mathcal{A}_{cp}(B^+ o K^+ pi^0)=-0.014pm 0.021pm 0.006$. We confirm the positive sign of $mathcal{A}_{cp}$ in $B^+ o K^+ pi^0$ and no charge asymmetry be observed in other decays. | en |
| dc.description.provenance | Made available in DSpace on 2021-05-20T19:58:37Z (GMT). No. of bitstreams: 1 ntu-100-R97222073-1.pdf: 43483388 bytes, checksum: 75245563310789adb13981da745fd584 (MD5) Previous issue date: 2011 | en |
| dc.description.tableofcontents | 1 Introduction 1
1.1 Standard Model . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 The Cabibbo-Kobatashi-Maskawa matrix . . . . . . . . . . . . 1 1.3 CP violation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.3.1 General Formula . . . . . . . . . . . . . . . . . . . . . 4 1.3.2 CP Violation Cases in B Decays . . . . . . . . . . . . . 5 1.4 The Charmless Two-body B decays . . . . . . . . . . . . . . . 8 1.5 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2 Belle Detector 15 2.1 The KEKB Accelerator . . . . . . . . . . . . . . . . . . . . . . 16 2.1.1 Beam Pipe . . . . . . . . . . . . . . . . . . . . . . . . . 19 2.2 Silicon Vertex Detector (SVD) . . . . . . . . . . . . . . . . . . 22 2.3 Extreme Forward Calorimeter (EFC) . . . . . . . . . . . . . . 22 2.3.1 Central Drift Chamber (CDC) . . . . . . . . . . . . . . 25 2.3.2 Aerogel Cherenkov counter system (ACC) . . . . . . . 26 2.4 Time of Flight (TOF) . . . . . . . . . . . . . . . . . . . . . . 28 2.4.1 Electromagnetic Calorimeter (ECL) . . . . . . . . . . . 31 2.5 KL and Muon Detector (KLM) . . . . . . . . . . . . . . . . . 32 3 Selection Criteria and Reconstruction 35 3.1 Data Sample . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 3.2 Event Selection . . . . . . . . . . . . . . . . . . . . . . . . . . 36 3.2.1 Charged Particle Selection . . . . . . . . . . . . . . . . 36 3.2.2 Particle Identification . . . . . . . . . . . . . . . . . . . 36 3.2.3 Neutral Pion Selection . . . . . . . . . . . . . . . . . . 37 3.2.4 Neutral Kaon Selection . . . . . . . . . . . . . . . . . . 39 3.3 Kinematic B Reconstruction . . . . . . . . . . . . . . . . . . . 41 3.4 Best Candidate . . . . . . . . . . . . . . . . . . . . . . . . . . 42 4 Background 45 4.1 Combinatorial Background . . . . . . . . . . . . . . . . . . . . 45 4.1.1 Kakuno Super Fox-Wolfram momentum(KSFW) . . . . 46 4.1.2 B flight direction (cosθB) . . . . . . . . . . . . . . . . 48 4.1.3 ΔZ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 4.2 Likelihood Ratio and the Transformation . . . . . . . . . . . . 49 4.3 BB Background . . . . . . . . . . . . . . . . . . . . . . . . . . 50 4.4 Feed-Across Background . . . . . . . . . . . . . . . . . . . . . 51 5 Fitting Strategy demonstrated by Control Sample 63 5.1 Sample . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 5.2 Consistency Check . . . . . . . . . . . . . . . . . . . . . . . . 64 5.2.1 Event Selection . . . . . . . . . . . . . . . . . . . . . . 64 5.2.2 LR Distribution of Continuum . . . . . . . . . . . . . 66 5.2.3 Correlation Check and PDF Modelling in Control Sample 68 5.2.4 Branching Fraction of B+ → D0(K+π−π0)π+ . . . . . 71 5.3 Toy Monte Carlo with 2D and 3D Fitting Strategy . . . . . . 75 5.4 Mean shift and Fudge Factor . . . . . . . . . . . . . . . . . . . 77 6 Signal Extraction 81 6.1 Correlation Check . . . . . . . . . . . . . . . . . . . . . . . . . 81 6.2 PDF Modelling . . . . . . . . . . . . . . . . . . . . . . . . . . 82 6.3 Fitting Strategy . . . . . . . . . . . . . . . . . . . . . . . . . . 91 6.4 Fitting Results . . . . . . . . . . . . . . . . . . . . . . . . . . 94 7 Measurements for Branching Fraction and Charge Asymmetry 97 7.1 Branching Fraction . . . . . . . . . . . . . . . . . . . . . . . . 97 7.2 Charge Asymmetry . . . . . . . . . . . . . . . . . . . . . . . . 98 7.3 Systematic Uncertainty of BR. . . . . . . . . . . . . . . . . . 103 7.3.1 LR Cut . . . . . . . . . . . . . . . . . . . . . . . . . . 105 7.3.2 Feed-Across . . . . . . . . . . . . . . . . . . . . . . . . 106 7.4 Systematic Uncertainty of Acp . . . . . . . . . . . . . . . . . . 107 8 Summary and Conclusion 109 8.1 Results and Comparison . . . . . . . . . . . . . . . . . . . . . 109 8.2 K/π Asymmetry Puzzle . . . . . . . . . . . . . . . . . . . . . 114 8.3 Partial Width . . . . . . . . . . . . . . . . . . . . . . . . . . . 116 A Discussion on Correlation and PDF in B± → h±π0 119 A.1 Correlation and Definition of Mbc . . . . . . . . . . . . . . . . 119 A.1.1 Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 A.1.2 Background . . . . . . . . . . . . . . . . . . . . . . . . 123 A.1.3 Comparison . . . . . . . . . . . . . . . . . . . . . . . . 124 A.2 Probability Density Function . . . . . . . . . . . . . . . . . . . 127 B Ensemble Test 129 | |
| dc.language.iso | en | |
| dc.title | B^±→h^± h^0之二體稀有衰變與電荷宇稱破壞之量測 | zh_TW |
| dc.title | Measurements of Branching Fractions and Direct $CP$ Violations in $B o hh^0$ decays. | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 99-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 王名儒(Min-Zu Wang),侯維恕(George Wei-Shu Hou),熊怡(Bob Yee Hsiung),張敏娟(Ming-Chuan, Chang) | |
| dc.subject.keyword | 高能物理,加速器,B物理,電荷宇稱破缺,稀有衰變,衰變分枝比, | zh_TW |
| dc.subject.keyword | high energy physics,Belle,KEK,B physics,direct CP violation,B meson,rare decay,branching fraction,charge asymmetry, | en |
| dc.relation.page | 139 | |
| dc.rights.note | 同意授權(全球公開) | |
| dc.date.accepted | 2011-08-18 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 物理研究所 | zh_TW |
| Appears in Collections: | 物理學系 | |
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| ntu-100-1.pdf | 42.46 MB | Adobe PDF | View/Open |
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